INTRODUCTION. 



By Charles Schuchert. 



This catalogue is an alphabetic list of all the types (holotypes, 

 cotypes, paratypes), the subsequently described or figured specimens 

 (plesiotypes), and the artificial casts of type specimens of fossil inverte- 

 brates in the Department of Stratigraphic Paleontology of the U. S. 

 National Museum previous to 1905. No account is taken of "typical 

 specimens ' ' nor of such studied material as has served in publications 

 but which is not so recorded in the literature of paleontology and strati- 

 graphic geology. 



The information relating to each entry is given in the following order: 

 (1) Catalogue number of the department registers, (2) name of species 

 practically as written in the work cited, (3) kind of type, (4) formation, 

 (5) locality, (6) author and place of publication, and (7) remarks on 

 the present name if different from the one cited, or a cross reference 

 when the same species appears in the catalogue under more than one 

 name. Some notice is taken of synonymy, but as a rule only when this 

 had been known previous to the making of this catalogue. In the case 

 of remarks, these are always in brackets and signed by the author of the 

 information, when not furnished by the present writer. 



No record is made of figures republished in text-books. In cases 

 where a part of the material is lost, this fact is noted by the absence in 

 the citation of the figures representing the missing material, no account 

 being taken where all the specimens of an author are lost. 



An author's name in parenthesis indicates that the person cited did 

 not use the genus or combination as given. It has not been thought 

 necessary to give the author who first made the change as adopted in 

 this catalogue. 



This catalogue was begun in response to a circular letter by the late 

 Dr. G. Brown Goode, dated December 17, 1895. He wrote: 



I am anxious to include a statement exactly, or approximately, showing the num- 

 ber of species, represented by types, in each department. * * * It is proposed 

 to publish at an early day a series of full catalogues of the type specimens in the 

 several departments of the museum. 



At that time no catalogues of this nature had been prepared, nor were 

 all the type specimens distinguished in the collection. The writer then 

 made a card catalogue of the Paleozoic forms, while Dr. T. W. Stanton 

 and Dr. W. H. Dall assisted with the Mesozoic and Cenozoic species, 



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